Rescue Rover. Robotics Unit Lesson 1. Overview
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- Iris Briggs
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1 Robotics Unit Lesson 1 Overview In this challenge students will be presented with a real world rescue scenario. The students will need to design and build a prototype of an autonomous vehicle to drive through a hazardous environment to perform a rescue operation. The students will prototype a rescue vehicle using the LEGO MINDSTORMS NXT kit and program the NXT brick using LabVIEW Education Edition (LVEE). The students will also be introduced to the engineering design process in this lesson. Sample Vehicle (without supply carrier) Sample Program #1 Sample Program #2 Expectations Students should be able to: Build a sturdy NXT car with 2 motors using the NXT kit. Use LabVIEW to program their NXT vehicle to drive a specified distance first using direct mode, then remote mode. Use the engineering design process to solve the given challenge. Evidence Evidence of learning found in: A NXT vehicle that is sturdy, within size requirements, and able to drive a specified distance using direct and remote mode. Commented LabVIEW code. Engineer s journal. Copyright 2009 Center for Engineering Education and Outreach 1
2 Lesson 1 Suggested Time 90 minute Vocabulary (See Glossary-Appendix C) Autonomous vehicle Virtual Instrument (VI) Front panel Block diagram Code Direct mode Remote mode Compile Download Engineering design process Prototype Materials Each student: Engineer s Journal Each student group: LEGO MINDSTORMS kit Computer with LabVIEW Education Edition Teacher Preparation Build a sturdy car example. Arrange students in pairs. * Distribute Engineer s Journals. Challenge A group of mountain climbers are stranded atop Mt. Everest. Unfortunately, a storm is approaching and rescuers will not be able to attempt a rescue until the storm has passed. The stranded mountaineers are in desperate need of food, water, and medical supplies. The conditions are too harsh for a helicopter to drop off the supplies. Your team of robotics specialists has been brought in to build an autonomous vehicle, no larger than 12 x 9 x 9 in dimension, that can deliver the much needed food and medical supplies to the stranded mountain climbers. In the first part of the challenge you will build a small prototype of the vehicle that can drive up a straight, narrow path. You have one hour to complete the challenge. Background This lesson introduces the students to the LEGO MINDSTORMS NXT construction kit, LabVIEW Education Edition software, and the engineering design process. The NXT kit contains an NXT programmable brick, technic building pieces, motors, and the following sensors: Light sensor Touch sensor Ultrasonic sensor Sound sensor Rotation sensor (built into the motors) The students can build a wide range of robotic devices using this kit. Copyright 2009 Center for Engineering Education and Outreach 2
3 Lesson 1 Real World Connection Engineers in industry use LabVIEW programming software to set up tests, collect data, etc. The NXT brick can be programmed using LabVIEW Education Edition, a graphical programming language from National Instruments. LabVIEW programs are called virtual instruments (VI) and every program consists of a front panel and a block diagram as shown below. Front panel Block diagram The front panel is where you create a user interface and the block diagram is where you write your code by wiring together graphical representation of functions and VIs. The code is a series of commands that tells your robot what to do. The code in the above block diagram turns on the motor attached to port A for 3 seconds then stops the motor using the brake. Copyright 2009 Center for Engineering Education and Outreach 3
4 Lesson 1 Programming Tip You can think of direct mode as the computer being the brain and remote mode as the NXT brick being the brain. Programs in remote mode take less time to execute than programs in direct mode because information does not need to be sent back and forth between the computer and the NXT brick. For this reason you will want to execute most of your programs in remote mode. LabVIEW programs can be executed in two modes: direct and remote. In direct mode, the NXT brick is connected to the computer via USB or Bluetooth and the program executes on the computer. In remote mode, the program created on the computer is compiled and then downloaded to the NXT brick, and then the program can be executed from the NXT brick any time--the NXT brick does not need to be connected to the computer. computer sends commands to the NXT (computer connection always required) Direct mode is useful for debugging a program because you can display output values to the front panel. You can also plot sensor values on the front panel in real time. compile code and download Direct mode code runs on NXT computer connection not required Remote mode This lesson covers both direct and remote mode programming. The engineering design process is an eight-step guideline that engineers follow to ensure that their product is designed efficiently and effectively (see Appendix A). The students will need to develop possible solutions to address the mining challenge, then select the best possible solution and construct a prototype of the rescue vehicle. Vehicles that are not sturdy, unable to drive, or does not meet the design requirements will need to be redesigned. Copyright 2009 Center for Engineering Education and Outreach 4
5 Lesson 1 Real World Connection In a real world rescue mission, engineers would have limited time, materials, and space to develop a solution. Explain to the students that the challenge is intended to simulate the real world so they all need to think and act like engineers. Hardware Tip Note that a rotation sensor is built into the motors. It is the only sensor that does not plug into ports 1, 2, 3, or 4. Instructions Part I: Introduction 10 minutes 1. Introduce the challenge to the students. As a class, identify the problem and design constraints of constructing the model (step 1 of the design process). 2. Define a prototype as a model of a design on which tests can be performed to evaluate whether the design should be used for the final product. 3. Introduce the students to the NXT hardware that they will use to construct their rescue vehicles. a. Go over the names of the parts in the NXT kit (see Appendix B). b. Explain that the NXT brick has 3 output ports (A, B, C) on the top where motors are attached and 4 input ports (1, 2, 3, 4) on the bottom where sensors are attached. A B C Classroom Tip Having a pre-built example for students is a great way to introduce a project. This allows students to gain ideas and more clearly understand the challenge c. Show the students the sample sturdy car that they will build. Students can either follow directions to build the car or design a car that look completely different, but still meet the size and structure requirements. Copyright 2009 Center for Engineering Education and Outreach 5
6 Lesson 1 Building Tip Visit LEGOengineering.com and select the Building & Programming Guide tab for more examples of NXT cars and building tips. Part II: Building 30 minutes 1. Give each pair of students an NXT kit and instructions for how to build a basic car show below (see Appendix C). Why? An important part of an engineer s job is to document his/her designs, so that other engineers can add features, make changes, and/or use the design to gain ideas on future designs. Students should get in the habit recording their work. 2. Have the students build a two motor car either following the building instructions or one of their own designs. 3. When the students finish building their cars, they should spend a few minutes brainstorming how to build a container that can carry supplies (represented by a red and a blue ball that comes with the kit) to the stranded mountain climbers. The container can be a trailer and/or a box on top of the NXT car. The students should write or draw their ideas in their Engineer s Journal. Remind the students that the entire rescue vehicle, including the supplies container, needs to be smaller than 12 in length, 9 in width and height. 4. Have the students build the container and attach it to their car. 5. The rescue vehicle (car plus container) has to pass the following tests to be deemed sturdy: a. Shake test The teacher must be able to shake the car without pieces falling off. b. Drop test The teacher must be able to drop the car from the height of his/her ankle without the car breaking. 6. Rescue vehicles that are not sturdy need to be redesigned. 7. As the students finish building their rescue vehicles, remind them to draw diagrams of their finished designs in their Engineer s Journal. 8. Have the students set the rescue vehicle aside as you introduce the programming portion of the activity. Copyright 2009 Center for Engineering Education and Outreach 6
7 Lesson 1 Programming Tip Ask the students to think of programming sequence commands they would give themselves to complete the task. Part IV: Programming 30 minutes 1. Explain to the students that they will now program their NXT rescue vehicles to operate autonomously without input from the user. A program is a series of commands that the NXT follows. These commands need to be as specific as possible. As a class try writing out a series of commands the rescue vehicle needs to follow in order to succeed in the mission. For example: Drive forward For x distance Stop You can compare palettes to toolboxes. There are different palettes or toolboxes that hold different VIs or tools to create your own program. 2. Introduce the students to LabVIEW Education Edition software. Explain the basics of LabVIEW by giving the students a tour of the core components (front panel, block diagram, palettes, etc.). Most of the VIs they will want to use in this activity, like motor or wait commands can be found in either the NXT I/O or Complete palette shown below. NXT I/O palette Copyright 2009 Center for Engineering Education and Outreach 7
8 Lesson 1 Programming Tip The NXT I/O palette contains most, but not all of the functions found in the Complete palette. The difference between the two palettes is that VIs on the NXT I/O palette has polymorphic VI selector menus (purple drop-down menu) that allow you to select a few different modes of the VI without physically replacing the VI. Complete palette Turn on context help by selecting Show Context Help from the Help menu. NXT Module Help is also found under the Help menu. 3. Show the students where they can find help resources such as context help and the detailed help documentation for the NXT Module. Context help describes what the VI does, lists the available inputs and outputs, and the default input values. The detailed help documentation includes tips, a sample program, and examples. 4. The first program will be written in direct mode. Demonstrate how to program the NXT brick using LabVIEW by writing a short program to drive, wait x seconds, then brake as show below. Copyright 2009 Center for Engineering Education and Outreach 8
9 Lesson 1 Programming Tip All VIs have default values, for example the default settings for the motor on VI is All Ports for the port input terminal and 75 for the power setting. Context help clearly identifies these values if you mouse-over a VI. Wire the commands together in the order you want them to execute. Every VI has terminals that the wires connect to. Double-click on an empty spot on the block diagram to create a textbox to write a comment. 3. Have the students copy the program, then test their cars to determine the proper value of x that will allow them to drive their car 6. Encourage the students to keep track of time versus distance in a table as shown below. Then, students can create a graph with this information to find the exact time needed to travel 6. Time (s) Distance (in) Distance (in) Time (s) 4. Instead of modifying the time constant, students can also modify the motor power level. The students can think about the tradeoff between how fast their rescue vehicle can deliver the supplies to the stranded mountain climbers versus the accuracy (driving the exact distance). Also consider the safety of the cargo, as stopping too abruptly may break fragile supplies. 5. The students should add comments to their code so that the next time they look at their code they know what the code is supposed to do. This also allows other people to easily understand their code, similar to the concept of drawing the design of their vehicle. 6. Once the students understand how to program the NXT in direct mode, explain the difference between direct mode and remote mode. They will need to use this mode to drive the rescue vehicle 6 (the second challenge). Show them how to switch between the two modes using the File menu. When you are in direct mode, you see a white box that says Main Application Instance in the lower left-hand corner of the front panel and block diagram (see below). When you are in remote mode, you see an orange box that says the name of the NXT that is connected to the computer; in this case the name of the NXT attached is named Darby (see below). 3 Copyright 2009 Center for Engineering Education and Outreach 9
10 Lesson 1 Programming Tip If Control-T (PC) or Command-T (Mac) tiles the LabVIEW front panel and block diagram instead of switching between the direct and remote mode, go to Tools\NXT Preferences\click on the Miscellaneous tab in the NXT Module Systems Preferences dialog box that opens. Then check off the option that allows you to use Control-T (PC) or Command-T (Mac) shortcut. Direct mode Remote mode Copyright 2009 Center for Engineering Education and Outreach 10
11 Lesson 1 Useful Circle Formulas Circumference = 2*π*radius Linear distance = radius*angle (radians) 180 = π radians Programming Tip Numeric palette: 6. Have the students test out their program in remote mode. Their rescue vehicle should still travel Ask the students to program their vehicle to drive for 6 using remote mode. They should be able to find the exact time needed using the same method as before. 8. Once the students successfully get their car to drive for 6 using the trial and error method, challenge them to mathematically calculate the number of degrees the wheels need to rotate to travel 6. Instead of controlling the rescue vehicle with time, they can control it using the rotation sensors that are built into the motors. The drive distance VI, located in the Complete palette, takes distance (in degrees) as an input. To calculate the distance in degrees, the students will need to divide the linear distance to travel by the radius of the wheel and convert that output which is in radians into degrees. Remind the students to add comments their code. 9. Once again the students should consider the tradeoff between speed and accuracy (the students can adjust the power going into the motors, the default power level is 75). Copyright 2009 Center for Engineering Education and Outreach 11
12 Lesson 1 Part V: Class Discussion / Reflection 20 minutes 1. When all the students have completed the challenge, have the students present their design and demonstrate their final solution. Ask the students: a. What did you brainstorm (car or container) that you did not use? b. What difficulties did you overcome in building? In programming? c. Were you able to get your car to stop at the exact location? 2. What is the trade-off between speed and accuracy? 3. Instead of using trial and error to find the how long the motor has to run to travel a certain distance, how can you calculate it? What is the relation between motor rotation, speed, distance, and time? 4. Go over the engineering design process with the students. Refer to things that happened during the activity that illustrate the different steps. Discuss with the students which steps they completed naturally and which ones they skipped and how the skipped steps might have been helpful. Extensions 1. Programming: Program the rescue vehicle to return to the start. 2. Building: Build a device that can pick up and drop off cargo, instead of simply carrying it. (Hint: this will require another NXT motor.) 3. Teamwork: Collect cargo directly from another group s rescue vehicle. Copyright 2009 Center for Engineering Education and Outreach 12
13 Lesson 1 Sample Projects and Photos Photo of sample NXT car with wires: Sample Code: Trial and error method: Mathematically determined method: Copyright 2009 Center for Engineering Education and Outreach 13
14 Lesson 1 Engineer s Journal 1. Write down and/or draw your rescue vehicle design ideas: 2. Create a sketch of the mechanism you constructed, label the parts, and give the overall dimension of your vehicle: Copyright 2009 Center for Engineering Education and Outreach 14
15 3. What features does your prototype have? 4. How do you plan to program your car to drive 6? 5. How long did it take your car to drive 6? 6. How long did it take your car to drive 6? 7. What are some of the challenges that you encountered in this activity? 8. What did you learn from this activity? Copyright 2009 Center for Engineering Education and Outreach 15
16 Appendix A Engineering Design Process Massachusetts Science and Technology/Engineering Curriculum Framework, October Identify the need or problem. 2. Research the need or problem a. Examine the current state of the issue and current solutions b. Explore other options via the internet, library, interviews, etc. 3. Develop possible solution(s) a. Brainstorm possible solution(s) b. Draw on mathematics and science c. Articulate the possible solution(s) in two or three dimensions d. Refine the possible solution(s) 4. Select the best possible solution(s) a. Determine which solution(s) best meet(s) the original need or solve(s) the original problem 5. Construct a prototype Copyright 2009 Center for Engineering Education and Outreach 16
17 a. Model the selected solution(s) in two and three dimensions 6. Test and evaluate the solution(s) a. Does it work? b. Does it meet the original design constraints? 7. Communicate the solution(s) a. Make an engineering presentation that includes a discussion of how the solution(s) best meet(s) the initial need or the problem b. Discuss societal impact and tradeoffs of the solution(s) 8. Redesign a. Overhaul the solution(s) based on information gathered during the tests and presentation Copyright 2009 Center for Engineering Education and Outreach 17
18 Appendix B LEGO MINDSTORMS NXT Kit Parts Copyright 2009 Center for Engineering Education and Outreach 18
19 Appendix B LEGO MINDSTORMS NXT Kit Parts Copyright 2009 Center for Engineering Education and Outreach 19
20 Appendix C NXT Car Building Instructions Two motor car: Required pieces: Copyright 2009 Center for Engineering Education and Outreach 20
21 Appendix C NXT Car Building Instructions Step 1: Prepare NXT Side Views Attach a double black connector peg and a single black connector peg to both sides of the NXT. Connect the double peg vertically in the top most holes. The single peg should be connected in the middle horizontal hole. Your NXT should look like the below picture before moving on to the next step. Copyright 2009 Center for Engineering Education and Outreach 21
22 Appendix C NXT Car Building Instructions Step 2: Attach Motors to the NXT Side View Top View Attach the motors (one per side) to the NXT using the double black connector pegs and the short black connector pegs attached to the NXT. The red dots in the side view identify which holes on the motor attach to the pegs. Your NXT should look like the below picture before moving on to the next step. Note: The top connection of the double black connector peg is not connected to anything. Copyright 2009 Center for Engineering Education and Outreach 22
23 Appendix C NXT Car Building Instructions Step 3: Support Motors Take an 11-holed rounded beam and attach two short black connector pegs to the outside holes as seen in the red square. Connect the pegs to the back of each motor (as identified by the red dots) to further support the motors to the NXT. Your NXT should look like the below picture before moving on to the next step. Copyright 2009 Center for Engineering Education and Outreach 23
24 Appendix C NXT Car Building Instructions Step 4: Attach Wheels Assemble 2 rear wheel assemblies using a 6-length axle, a wheel, and a hub. Attach one to each motor as seen below. Copyright 2009 Center for Engineering Education and Outreach 24
25 Appendix C NXT Car Building Instructions Step 5: Front Wheel Base Assembly Step 6: Front Wheel Assembly Attachment Copyright 2009 Center for Engineering Education and Outreach 25
26 Appendix C NXT Car Building Instructions Finished NXT Vehicle: Copyright 2009 Center for Engineering Education and Outreach 26
27 Appendix D Glossary Autonomous vehicle: A vehicle that operates independent of continual input from the user. Block diagram: Part of the LabVIEW program where you write your code by wiring together graphical representation of functions and VIs. Code: A series of commands that tells the robot what to do. Compile: Translates the code into a language that the processor can understand. Direct mode: The NXT brick is connected to the computer via USB or Bluetooth and the program executes on the computer. Download: Loads the compiled program onto the NXT brick. Engineering design process: An eight-step guideline that engineers follow to ensure that their product is designed efficiently and effectively. Front panel: Part of the LabVIEW program where you create a user interface. Prototype: A model of a design on which tests can be performed to evaluate whether the design should be used for the final product. Remote mode: The NXT brick does not need to be connected to the computer and the downloaded program executes on the NXT brick. Virtual Instrument (VI): A LabVIEW program. Copyright 2009 Center for Engineering Education and Outreach 27
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